So far no one has.
Just a small excerpt of discussions I remember reading or
participating in, In chronological order:
http://lalists.stanford.edu/lad/2002/05/0420.html
http://lists.linuxaudio.org/pipermail/linux-audio-dev/2004-January/006293.h…
http://lists.linuxaudio.org/pipermail/linux-audio-dev/2006-September/016810…
I even entertained the idea of using sqlite and made some tests once, go figure.
Everyone can advocate a format and there are compelling arguments for
every single one of them. The difficulty lies in convincing other
developers with different views and priorities to adopt yours. Good
luck with that!